Migrate data using the command line

--calendar_migration_end_date

Specifies the end date for calendar events you want to migrate. Events that take place after this date aren't migrated.

Example: --calendar_migration_end_date="2020-01-01"

--calendar_migration_start_date

Specifies the start date for calendar events you want to migrate. Calendar events before this date aren't migrated.

Example: --calendar_migration_start_date="2018-01-01"

--custom_label_prefix

Specifies the prefix to attach to all labels in Gmail.

Example: --custom_label_prefix="migrated-"

--email_migration_end_date

Specifies the end date for email messages that you want to migrate. Messages after this date aren't migrated

Example: --email_migration_end_date="2020-01-01"

Date in YYYY-MM-DD format

--email_migration_start_date

Specifies the start date for email messages that you want to migrate. Messages before this date aren't migrated.

Example: --email_migration_start_date="2018-01-01"

--enable_calendar_fanout

Enables calendar event fan-out for calendar migration.

--enable_hidden_folders_migration

Enables hidden MAPI (Exchange or PST) folder migration.

--enable_imap

Enables migration from an IMAP server rather than from an Exchange server.

--enable_mbox_logging

Enables mbox logging. Messages that can't be migrated due to Gmail file size or type restrictions are written to a user-specific mbox file. The mbox file is located in the GWMME trace logging folder path (for example, %localappdata%\Google\Google Apps Migration\Tracing\ExchangeMigration\mbox\[email protected]).

For details about Gmail message restrictions, go to File types blocked in Gmail.

--enable_public_folder_migration

Enables GWMME migration from Exchange public folders to Google Groups. For details, go to Migrate public folders. 

Note: You can't run a migration for both users and public folders at the same time.

--enable_resource_migration

Enables calendar resource migration.

--exchange_admin_login

Specifies the sign-in name for the Exchange server administrator account. Use this argument in conjunction with --source_server.

If you use this argument, don't use --exchange_profile_name.

Example: --exchange_admin_login="administrator"

--exchange_profile_name

Specifies the name of the Outlook profile you want to use to connect to your Exchange server. Specify an administrator profile on the same machine that runs GWMME. If you use this argument, do not use:

• --source_server
• --pst_base_folder
• --exchange_admin_login

Example: --exchange_profile_name="exch_migration_admin"

--exclude_message_classes

Excludes messages based on the message class. 

This argument is useful when excluding stubbed messages from an archiving solution. GWMME doesn't support the remigration of unstubbed messages. The recommended approach is to exclude stubbed messages and then, once the stubbed messages are fully rehydrated, migrate the messages in a second run of GWMME.

Example: --exclude_message_classes="ipm.note.eas,ipm.note.1"

--exclude_top_level_folders

Excludes top-level folders based on folder name. 

Example: --exclude_top_level_folders="Deleted Items,Drafts"

--filename

Includes the data belonging to the usernames specified in the CSV file. If you use this argument, do not use --migration_usernames.

Example: --filename="C:\Documents and Settings\users.csv"

--force_clear_google_calendar_ids_on_remigration

Clears the IDs of secondary calendars before you remigrate data. When you remigrate calendar data, GWMME creates new secondary calendars with unique IDs. Doing so avoids event conflicts.

Note: Use this argument before you remigrate data. For details, go to Migrate content again.

--force_restart

Reruns the migration on all items, rather than only on items that weren't successfully migrated.

By default, if a migration was interrupted, the next migration starts at the point where the previous migration stopped. You can use this parameter to run the migration again from the beginning. If you use this option, duplicate email is filtered out, previously migrated calendar events are ignored (but might get duplicated in some cases), and previously migrated contacts are duplicated.

--google_admin

Sets the event owner for calendar resources. If an event doesn't have an owner, GWMME sets the nominated administrator as the event owner. The user must have full access to resource calendars.

Example: --google_admin="[email protected]"

--google_domain

Specifies the Google Workspace domain where you're migrating data.

Example: --google_domain="example.com"

--help

Displays a list of the arguments for ExchangeMigration.exe.

--id_mapping_file

Specifies the name of the file that has complete mapping list. Use the CSV mapping file that contains user and calendar address mappings. For details, go to Create CSV files for your migration.

Examples: --id_mapping_file="resources.csv"

--imap_admin_id

Specifies the Cyrus IMAP administrator who has access to all IMAP accounts on the server. Use with --imap_admin_password.

Example: --imap_admin_id="[email protected]"

--imap_admin_password

Specifies the Cyrus IMAP administrator's password. Use with --imap_admin_id.

Example: --imap_admin_password="password"

--imap_path_prefix

Specifies the path prefix for user folders on an IMAP server.

Enter the IMAP folders' path prefix that is common to all folders. The path prefix is usually the IMAP namespace for the folder names. For example, if the IMAP folder listing for a user is, INBOX, INBOX.Sent, and INBOX.Drafts, then INBOX is the path prefix. Typical values of path prefix are INBOX for Cyrus and Courier or none (leave the field blank) for GroupWise IMAP, Gmail, and Dovecot.

Example: --imap_path_prefix="INBOX"

--imap_port

Specifies the port number for the IMAP server.

Example: --imap_port="143"

--imap_security

Specifies the security option you want to use. Use one of the following codes:

• 0 (no security)
• 1 (SSL)
• 2 (STARTTLS)

Example: --imap_security="1"

--imap_server_type

Specifies the type of IMAP server you're migrating from. Server types are Exchange, GroupWise, Gmail, Cyrus, Courier, Dovecot, Zimbra, and unsupported. The default is unsupported.

Note: If you specify an incorrect server type, the performance of the migration might be affected.

Example: --imap_server_type="Gmail"

--migrate_to_vault

Migrates email to Google Vault. Messages are uploaded to the user’s account and marked as deleted. Labels are not created in the user’s inbox.

Note the following restrictions:

• Google Vault retention rules determine how long the message is retained in Vault.
• If you are migrating to Vault, you must have Gmail turned on in the Admin console. If Gmail is off, you will see 403 errors. 
• Migration to Vault Former Employee (VFE) licensed users will fail because Gmail isn't turned on for these users. 

--migration_usernames

Specifies the list of users for migration. If you use this argument, don't use --filename.

Example: --migration_usernames="user1,user2,user3"

--noenable_calendar_migration

Runs the migration without including calendar data.

--noenable_contact_migration

Runs the migration without including contact data.

--noenable_email_migration

Runs the migration without including email data.

--noenable_error_reports

Prevents GWMME from generating migration reports, which show any message errors that occur during a migration. Skipping migration reports can improve the performance of a migration.

For more information about migration reports, go to the Reviewing migration reports section in the GWMME Admin Guide.

--noenable_id_mapping

Runs the migration without requiring a mapping file. All mapping data is defined in the list of users if you use the --id_mapping_file argument.

--noenable_label_prefix

Specifies that a prefix won't be added to labels when migrating from PST files. By default, the name of the PST file is added as a prefix to labels and calendars created during the migration.

--nouse_gui

Runs GWMME using the command line. Graphical user interface (GUI) mode is the default.

--nowait

Closes GWMME without you needing to press the Enter key when the migration is run from the command line.

--num_threads

Specifies the number of users you want to migrate concurrently. A separate thread is opened for each user. The default is 25 threads.

Example: --num_threads="20"

--pst_base_folder

Specifies the directory that contains the PST files for migration. GWMME migrates all PST files in the subfolders of the specified folder.

If you use this argument, do not use:

• --source_server
• --exchange_profile_name

Example: --pst_base_folder="C:\pst"

--public_folder_mapping_file

Specifies the mapping file name. The mapping file maps Exchange public folder paths to Google Groups email addresses. For details, go to Migrate public folders.

Example: --public_folder_mapping_file="public_folder_mapping.csv"

--retry_count

Specifies the number of retries if a temporary failure occurs, such as a busy server  timeout. The default is 10.

Example: --retry_count="5"

--run_diagnostics

Runs the exhaustive pre-migration diagnostics, which validates server connectivity, authentication, access to accounts, and the entire user list.

--service_account_json_path

Specifies the path to the service account credentials file. For instructions on obtaining this file, go to Authorize GWMME for your account. 

Example: --service_account_json_path ="C:\Users\admin\privatekey.json"

--source_server

Specifies the Exchange or IMAP server IP address or fully qualified domain name. 

In Exchange migrations, use this in conjunction with --exchange_admin_login. If you use this argument, do not use --exchange_profile_name.

Example: --source_server="mailserver.example.com"

--strip_user_labels

Specifies that messages are migrated without labels.

--translate_conflicting_events

Instructs GWMME to look at existing events already migrated to Google Calendar and modifies the events by translating the email address of the Exchange resource to that of the matching Google Workspace resource.

Many administrators choose to migrate users first and calendar resources second. If you choose to migrate calendar resources second, configure GWMME to remigrate the users' calendar data. Do this by using --translate_conflicting_events.